Oil shale ash（OSA） supported nanoscaled zero-valent iron（OSA-nZVI） was used as a rapid and efficient reductant for Cr（VI） reduction. The optimal mass ratio of nZVI to OSA and the optimal dosage were explored. Th...Oil shale ash（OSA） supported nanoscaled zero-valent iron（OSA-nZVI） was used as a rapid and efficient reductant for Cr（VI） reduction. The optimal mass ratio of nZVI to OSA and the optimal dosage were explored. The effects of initial pH, reaction temperature, initial Cr（VI） concentration, and common cations and anions in ground- water on Cr（VI） reduction were determined in batch experiments. The results show that the optimum initial pH is 5.0. The reaction temperature has a positive effect on Cr（VI） reduction while the real groundwater has a negative effect. Additionally, 84.22% Cr（VI） was still reduced by 3 g/L OSA-nZVI（1：2）（mass ratio of OSA to Fe^0 was 1：2） within 120 min for 50 mg/L Cr（VI） under conditions of 10℃ and unadjusted pH.展开更多
As a strong reducing radical,carbon dioxide anion radical(CO·-2)can be generated by initiating sulfate radical(SO·-4)in the presence of tonnate anions(FA)for Cr(Ⅵ)reduction.Moreover,activated carbon(AC)-cat...As a strong reducing radical,carbon dioxide anion radical(CO·-2)can be generated by initiating sulfate radical(SO·-4)in the presence of tonnate anions(FA)for Cr(Ⅵ)reduction.Moreover,activated carbon(AC)-catalyzed persultate(PS)oxidation is an economically justifiable,enⅥronmentally friendly,and easy-to-scalemethod to produce SO·-4 The complete removal of Cr(Ⅵ)was achieved within 280 min for an initial Cr(Ⅵ)concentration of 50 mg/L under the optional condition of c(AC)=1 g/L,[PS]0=1O mmol/L,[FA]0=10 mmol/L,T=30℃,and unadjusted pH.When the molar ratio of FA to PS was greater than or equal to 1,the system maintained a strong reduction state.The mechanism investigation confirmed that FA was converted to carboxyl anion radical(CO2·-2)as the predominant radical tor Cr(Ⅵ)reduction.This novel system may offer a potential plattbnn teclmology tor Cr(Ⅵ)wastewater treatment.展开更多
基金Supported by the National Natural Science Foundation of China（No.41302184）.
文摘Oil shale ash（OSA） supported nanoscaled zero-valent iron（OSA-nZVI） was used as a rapid and efficient reductant for Cr（VI） reduction. The optimal mass ratio of nZVI to OSA and the optimal dosage were explored. The effects of initial pH, reaction temperature, initial Cr（VI） concentration, and common cations and anions in ground- water on Cr（VI） reduction were determined in batch experiments. The results show that the optimum initial pH is 5.0. The reaction temperature has a positive effect on Cr（VI） reduction while the real groundwater has a negative effect. Additionally, 84.22% Cr（VI） was still reduced by 3 g/L OSA-nZVI（1：2）（mass ratio of OSA to Fe^0 was 1：2） within 120 min for 50 mg/L Cr（VI） under conditions of 10℃ and unadjusted pH.
基金Supported by the National Nature Science Foundation of China(No.41302184)the Project of the Research on Water Environmental Protection Strategy and Management Policy in Beijing-Tianjin-Hebei Region,China(No.2018ZX07111001)+2 种基金the Scientific Frontier and Interdisciplinary Research Project of Jilin Universitythe Outstanding Youth Cultivation Plan of Jilin University,the Fund of the Key Laboratory of Groundwater Resources and Environmental of Ministry of Education(Jilin University) Chinathe Project of the National and Local Joint Engineering Laboratory for Petrochemical Contaminated Site Control and Remediation Teclmology of China.
文摘As a strong reducing radical,carbon dioxide anion radical(CO·-2)can be generated by initiating sulfate radical(SO·-4)in the presence of tonnate anions(FA)for Cr(Ⅵ)reduction.Moreover,activated carbon(AC)-catalyzed persultate(PS)oxidation is an economically justifiable,enⅥronmentally friendly,and easy-to-scalemethod to produce SO·-4 The complete removal of Cr(Ⅵ)was achieved within 280 min for an initial Cr(Ⅵ)concentration of 50 mg/L under the optional condition of c(AC)=1 g/L,[PS]0=1O mmol/L,[FA]0=10 mmol/L,T=30℃,and unadjusted pH.When the molar ratio of FA to PS was greater than or equal to 1,the system maintained a strong reduction state.The mechanism investigation confirmed that FA was converted to carboxyl anion radical(CO2·-2)as the predominant radical tor Cr(Ⅵ)reduction.This novel system may offer a potential plattbnn teclmology tor Cr(Ⅵ)wastewater treatment.
